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Title: Elevated temperature tensile behavior of Ti-25Al-10Nb-3V-1Mo

Abstract

The effects of microstructure and temperature on tensile and fracture behavior were explored for the titanium aluminide alloy Ti-25Al-10Nb-3V-1Mo. Three microstructures were selected for study in an attempt to determine the role of the individual microstructural constituents in this {alpha}{sub 2} + B2 alloy. Tensile testing of both round and flat specimens in vacuum indicated a change in deformation behavior from 25 C to 450 C. Observations suggested that this change in deformation behavior occurred within the {alpha}{sub 2} phase. Failure initiation at 450 C and above was by a ductile process and was associated with the B2 phase. Above 600 C and at high strains, plastic deformation occurred predominantly in the B2 phase. Strain localization was observed above 600 C and found to be due to the lower work-hardening rate of the B2 phase. Strain localization at slip band intersections with prior {beta} grain boundaries resulted in rapid strain accumulation in the B2 phase. Alignment of secondary {alpha}{sub 2} laths with the tensile axis at high deformation levels appeared to inhibit shear band localization between voids due to a lack of participation of the {alpha}{sub 2} phase in deformation.

Authors:
 [1];  [2];  [3]
  1. Wright Lab., Wright-Patterson AFB, OH (United States)
  2. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
  3. GE Aircraft Engines, Cincinnati, OH (United States). Engineering Materials Technology Labs.
Publication Date:
OSTI Identifier:
31976
Resource Type:
Journal Article
Journal Name:
Metallurgical Transactions, A
Additional Journal Information:
Journal Volume: 26; Journal Issue: 3; Other Information: PBD: Mar 1995
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TITANIUM BASE ALLOYS; MICROSTRUCTURE; MECHANICAL PROPERTIES; ALUMINIUM ALLOYS; NIOBIUM ALLOYS; VANADIUM ALLOYS; MOLYBDENUM ALLOYS; ALLOY SYSTEMS; TEMPERATURE DEPENDENCE; TENSILE PROPERTIES; FRACTURE PROPERTIES; EXPERIMENTAL DATA

Citation Formats

Ward, C H, Thompson, A W, and Williams, J C. Elevated temperature tensile behavior of Ti-25Al-10Nb-3V-1Mo. United States: N. p., 1995. Web.
Ward, C H, Thompson, A W, & Williams, J C. Elevated temperature tensile behavior of Ti-25Al-10Nb-3V-1Mo. United States.
Ward, C H, Thompson, A W, and Williams, J C. Wed . "Elevated temperature tensile behavior of Ti-25Al-10Nb-3V-1Mo". United States.
@article{osti_31976,
title = {Elevated temperature tensile behavior of Ti-25Al-10Nb-3V-1Mo},
author = {Ward, C H and Thompson, A W and Williams, J C},
abstractNote = {The effects of microstructure and temperature on tensile and fracture behavior were explored for the titanium aluminide alloy Ti-25Al-10Nb-3V-1Mo. Three microstructures were selected for study in an attempt to determine the role of the individual microstructural constituents in this {alpha}{sub 2} + B2 alloy. Tensile testing of both round and flat specimens in vacuum indicated a change in deformation behavior from 25 C to 450 C. Observations suggested that this change in deformation behavior occurred within the {alpha}{sub 2} phase. Failure initiation at 450 C and above was by a ductile process and was associated with the B2 phase. Above 600 C and at high strains, plastic deformation occurred predominantly in the B2 phase. Strain localization was observed above 600 C and found to be due to the lower work-hardening rate of the B2 phase. Strain localization at slip band intersections with prior {beta} grain boundaries resulted in rapid strain accumulation in the B2 phase. Alignment of secondary {alpha}{sub 2} laths with the tensile axis at high deformation levels appeared to inhibit shear band localization between voids due to a lack of participation of the {alpha}{sub 2} phase in deformation.},
doi = {},
url = {https://www.osti.gov/biblio/31976}, journal = {Metallurgical Transactions, A},
number = 3,
volume = 26,
place = {United States},
year = {1995},
month = {3}
}